Justin Timberlake and Jimmy Fallon's 5 Best Collaborations (Video)

In this story

As the TV best friends prepare to reunite on "SNL," THR looks back at the dancing and singing that's made them great -- plus that time they played Jessica Simpson and Nick Lachey.

Justin Timberlake and Jimmy Fallon have some serious onscreen chemistry, and viewers are about to be treated to plenty of it on this week's Saturday Night Live. Fallon returns to host SNL while Timberlake is pulling musical-guest duties -- though he will undoubtedly pop into at least a few sketches.

The pair already teamed up for a Timberlake-centered "Timberweek" earlier this year on NBC's Late Night With Jimmy Fallon, which brought us (among other things) another installment of the History of Rap.

Things were going great, until Fallon unveiled his take on Timberlake's 'N Sync days. The pop star did not take it well.

Young Jimmy and Justin Sing "Only Wanna to Be With You" (Late Night, 2013)

Before they were famous, the best friends spent one magical summer in 1995 bunking together at camp, and plenty of Hootie & the Blowfish was involved.

Barry Gibb Talk Show (SNL, 2005)

Barry Gibb (Fallon) and his brother Robin (Timberlake) tackle hard-hitting issues, such as social security reform, with guests Nancy Pelosi (Cameron Diaz) and Ann Coulter (Drew Barrymore). The pair teamed up for five installments of the show, from 2003-2011. (Video courtesy of Yahoo Screen.)

Jessica Simpson and Nick Lachey (SNL, 2003)

It might seem in poor taste now to make fun of a couple whose marriage didn't work out, but back in 2003, Timberlake's take on Jessica Simpson wasn't that far from her own portrayal in her and then-husband Nick Lachey's MTV reality show, Newlyweds. (Video courtesy of Yahoo Screen.)

So what do you think? What's your favorite Timberlake/Fallon team-up? Let us know in the comments.